The U.S. Official Time (Atomic Clock) is at Time.gov. The Official Time or current time (Atomic Clock) is provided at Time.gov which shows you time zone changes, mapping of zones, and live time changes.

Time.Gov is provided free via the NIST. What is the NIST?

“From automated teller machines and atomic clocks to mammograms and semiconductors, innumerable products and services rely in some way on technology, measurement, and standards provided by the National Institute of Standards and Technology.

“Founded in 1901, NIST is a non-regulatory federal agency within the U.S. Department of Commerce. NIST’s mission is to promote U.S. innovation and industrial competitiveness by advancing measurement science, standards, and technology in ways that enhance economic security and improve our quality of life.”

Says Time.Gov:

” This public service is provided by the Time and Frequency Division of the National Institute of Standards and Technology (NIST). It uses the national time scale UTC(NIST) as its time reference.

“This web site is intended as a time-of-day service only. It should not be used to measure frequency or time interval, nor should it be used to establish traceability to NIST.”

Make sure your java is enabled for the clock to work.

Visit it Online HERE